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6、There is an endless supply of stories about sleepwalkers （夢(mèng)游者）．People have been said to climb on roofs, solve mathematical problems, write music, walk through windows, and do murder in their sleep．

       In Revere, Massachusetts, a hundred policemen searched for a lost boy who left his home in his sleep and woke up five hours later on a strange sofa in a strange living room, with no idea how he had got there．

       At the University of Lowa, a student was reported to have the habit of getting up in the middle of the night and walking three-quarters of a mile to the Lowa River．He would take a swim and then go back to his room to bed．

       An American expert on sleep claims （聲稱(chēng)） that he has never seen a sleepwalker．He is said to know more about sleep than any other living man, and during the last thirty-five years he has lost a lot of sleep watching people sleep．He says, “Of course, I know that there are sleepwalkers because I have read about them in the newspapers．But none of my sleepers ever walked, and if I were to advertise for sleepwalkers for an experiment, I doubt whether I would get many takers （應(yīng)征者）．”

       Sleepwalking, however, is a scientific reality．It is one of those strange things that sometimes look quite fantastic （怪誕的）．Doctors say that sleepwalking is much more common than is generally supposed．Many sleepwalkers do not try to find help and their sleepwalking is never recorded．

1．Generally speaking, sleepwalkers are people who ________．

       A．climb on roofs                                    B．walk through windows

       C．do fantastic things during their sleep      D．walk in a half-awake state

2．It was reported that a boy ________．

       A．was found on a strange sofa, telling how he had got there

       B．slept in his own room but woke up in a strange room

       C．lost his way five hours after he left home

       D．was searched for by policemen when he lost his way

3．There was a college student who got into the habit of ________．

       A．getting up in the middle of the night and walking down to the river

       B．walking three-quarters of a mile every day

       C．swimming in the Lowa River before going to bed

       D．walking about before he went to bed

4．Why do people think sleepwalking is nothing but a fantastic thing which doesn’t have any explanation?

       A．It is so common that it needn’t be recorded．

       B．Scientists take no interest in it．

       C．Most sleepwalkers do not seek help for their problem．

       D．No records about it have been made．